''Chiasmia emersaria'' is a

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of ...

of the family

Geometridae The geometer moths are moths belonging to the family Geometridae of the insect order Lepidoptera, the moths and butterflies. Their scientific name derives from the Ancient Greek ''geo'' γεω (derivative form of or "the earth"), and ''metr ...

. The species was first described by Francis Walker in 1861. It is found in

India India, officially the Republic of India ( Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the ...

Nepal Nepal (; ne, नेपाल ), formerly the Federal Democratic Republic of Nepal ( ne, सङ्घीय लोकतान्त्रिक गणतन्त्र नेपाल ), is a landlocked country in South Asia. It is ma ...

, northern

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is b ...

, China,

Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...

, Japan and the

Ryukyu Islands The , also known as the or the , are a chain of Japanese islands that stretch southwest from Kyushu to Taiwan: the Ōsumi, Tokara, Amami, Okinawa, and Sakishima Islands (further divided into the Miyako and Yaeyama Islands), with Yona ...

Description

The wingspan is about 32 mm in the male and 40 mm in the female. Outer margin of forewing prominently angled at vein 4. Hind tibia of male dilated. Body grey irrorated (sprinkled) with pale and dark brown. Abdomen with dark spots on dorsum. Forewings with subbasal dark speck. Indistinct oblique antemedial, medial, and postmedial lines angled below costa and arising from rufous patches or short bands on costa. There is a dark speck found at the end of the cell. The postmedial line with a costal rufous patch beyond it and disintegrated dark patch at vein 4. Outer area slightly darker and margin rufous below apex. Hindwing with indistinct antemedial line. Dark spot found at the end of the cell. There is a dark waved postmedial line, with rufous and grey suffusion beyond it. A marginal dark line is present. Both wings with the veins of pale outer area. Ventral side with broad rufous postmedial band with crenulate outer edge.

References

Macariini Moths of Japan {{Macariini-stub